//
//  Helpers.swift
//
//  Copyright © 2018 Kishikawa Katsumi
//  Copyright © 2018 BitcoinKit developers
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import Foundation

func ipv4(from data: Data) -> String {
    return Data(data.dropFirst(12)).map { String($0) }.joined(separator: ".")
}

func ipv6(from data: Data) -> String {
    return stride(from: 0, to: data.count - 1, by: 2).map { Data([data[$0], data[$0 + 1]]).hex }.joined(separator: ":")
}

func pton(_ address: String) -> Data {
    var addr = in6_addr()
    _ = withUnsafeMutablePointer(to: &addr) {
        inet_pton(AF_INET6, address, UnsafeMutablePointer($0))
    }
    var buffer = Data(count: 16)
    _ = buffer.withUnsafeMutableBytes { memcpy($0.baseAddress.unsafelyUnwrapped, &addr, 16) }
    return buffer
}
